Encoding apparatus

Details Encoding apparatus Encoding apparatus

1996-06-27

1999-03-02

Au, Amelia

Image analysis

Image compression or coding

Quantization

G06K 938

Patent

active

058781714

ABSTRACT:
An encoding apparatus uses a vector quantization encoding method for encoding indexes of codewords, which supply a scalar quantized code of a maximum scalar product value of each code word in a code book, and its maximum scalar product value to a vector component of an input image inputted from an image sensor, so as to output the encoded indexes. A scalar product value calculating circuit in the encoding apparatus has scalar product value calculating sections, which are composed of an analog circuit having a code component capacitor corresponding to each code component, a differential amplifier and a feedback capacitor, corresponding to each codeword, and the scalar product values of the input vectors are calculated in parallel by the scalar product value calculating sections. In such a manner, when the analog calculation is made, the scale of the circuit can be decreased and the power consumption can be lowered. Therefore, unlike the case where the calculation is made after A/D conversion, it is possible to avoid a problem that the number of times of calculations and the power consumption are remarkably increased due to increases in the number of dimensions of the input vector and the number of gradations.

REFERENCES:
patent: 4555668 (1985-11-01), Gregorian et al.
patent: 5142238 (1992-08-01), White
patent: 5502441 (1996-03-01), Swenson

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